Abstract
Two series of photosensitizer-electron acceptor complexes have been synthesized and fully characterized: ruthenium(II) tris(bipyridine) {[RuII(bpy)2(bpy-X-NDI)], where X = -CH2-, tolylene, or phenylene, bpy is 2,2′-bipyridine, and NDI is naphthalenediimide} and ruthenium(II) bis(terpyridine) {[RuII(Y-tpy)(tpy-X-NDI)], where Y = H or tolyl and X = tolylene or phenylene, and tpy = 2,2′:6′,2″-terpyridine}. The complexes have been studied by cyclic and differential pulse voltammetry and by steady state and time-resolved absorption and emission techniques. Rates for forward and backward electron transfer have been investigated, following photoexcitation of the ruthenium(II) polypyridine moiety. The terpyridine complexes were only marginally affected by the linked diimide unit, and no electron transfer was observed. In the bipyridine complexes we achieved efficient charge separation. For the complexes containing a phenyl link between the ruthenium(II) and diimide moieties, our results suggest a biphasic forward electron-transfer reaction, in which 20% of the charge-separated state was formed via population of the naphthalenediimide triplet state.
| Original language | English |
|---|---|
| Pages (from-to) | 2908-2918 |
| Number of pages | 11 |
| Journal | Inorganic Chemistry |
| Volume | 42 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - May 5 2003 |
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ASJC Scopus subject areas
- Inorganic Chemistry
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Electron donor-acceptor dyads based on ruthenium(II) bipyridine and terpyridine complexes bound to naphthalenediimide. / Johansson, Olof; Borgström, Magnus; Lomoth, Reiner; Palmblad, Magnus; Bergquist, Jonas; Hammarström, Leif; Sun, Licheng; Åkermark, Björn.
In: Inorganic Chemistry, Vol. 42, No. 9, 05.05.2003, p. 2908-2918.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electron donor-acceptor dyads based on ruthenium(II) bipyridine and terpyridine complexes bound to naphthalenediimide
AU - Johansson, Olof
AU - Borgström, Magnus
AU - Lomoth, Reiner
AU - Palmblad, Magnus
AU - Bergquist, Jonas
AU - Hammarström, Leif
AU - Sun, Licheng
AU - Åkermark, Björn
PY - 2003/5/5
Y1 - 2003/5/5
N2 - Two series of photosensitizer-electron acceptor complexes have been synthesized and fully characterized: ruthenium(II) tris(bipyridine) {[RuII(bpy)2(bpy-X-NDI)], where X = -CH2-, tolylene, or phenylene, bpy is 2,2′-bipyridine, and NDI is naphthalenediimide} and ruthenium(II) bis(terpyridine) {[RuII(Y-tpy)(tpy-X-NDI)], where Y = H or tolyl and X = tolylene or phenylene, and tpy = 2,2′:6′,2″-terpyridine}. The complexes have been studied by cyclic and differential pulse voltammetry and by steady state and time-resolved absorption and emission techniques. Rates for forward and backward electron transfer have been investigated, following photoexcitation of the ruthenium(II) polypyridine moiety. The terpyridine complexes were only marginally affected by the linked diimide unit, and no electron transfer was observed. In the bipyridine complexes we achieved efficient charge separation. For the complexes containing a phenyl link between the ruthenium(II) and diimide moieties, our results suggest a biphasic forward electron-transfer reaction, in which 20% of the charge-separated state was formed via population of the naphthalenediimide triplet state.
AB - Two series of photosensitizer-electron acceptor complexes have been synthesized and fully characterized: ruthenium(II) tris(bipyridine) {[RuII(bpy)2(bpy-X-NDI)], where X = -CH2-, tolylene, or phenylene, bpy is 2,2′-bipyridine, and NDI is naphthalenediimide} and ruthenium(II) bis(terpyridine) {[RuII(Y-tpy)(tpy-X-NDI)], where Y = H or tolyl and X = tolylene or phenylene, and tpy = 2,2′:6′,2″-terpyridine}. The complexes have been studied by cyclic and differential pulse voltammetry and by steady state and time-resolved absorption and emission techniques. Rates for forward and backward electron transfer have been investigated, following photoexcitation of the ruthenium(II) polypyridine moiety. The terpyridine complexes were only marginally affected by the linked diimide unit, and no electron transfer was observed. In the bipyridine complexes we achieved efficient charge separation. For the complexes containing a phenyl link between the ruthenium(II) and diimide moieties, our results suggest a biphasic forward electron-transfer reaction, in which 20% of the charge-separated state was formed via population of the naphthalenediimide triplet state.
UR - http://www.scopus.com/inward/record.url?scp=0037959952&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037959952&partnerID=8YFLogxK
U2 - 10.1021/ic020420k
DO - 10.1021/ic020420k
M3 - Article
C2 - 12716183
AN - SCOPUS:0037959952
VL - 42
SP - 2908
EP - 2918
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 9
ER -